C. Brain Stem D. axion 11. Which system works closely with the respiratory system? A. Skeletal system C. Circulatory system B. Excretory system D. Digestive system
-Blood vessels have RBC that contains hemoglobin. Hemoglobin consists of iron and oxygen. RBC with no oxygen are bound to enter the respiratory system via lungs for a cargo exchange-- RBC; proteins <=> Lungs; oxygen.
Answers & Comments
Answer:
C. Circulatory System
Explanation:
-Blood vessels have RBC that contains hemoglobin. Hemoglobin consists of iron and oxygen. RBC with no oxygen are bound to enter the respiratory system via lungs for a cargo exchange-- RBC; proteins <=> Lungs; oxygen.